BACKEND ENGINEERING•Databases Concurrency And Caching•Scaling Data•3.1 Replication

3.1.1 Replication

Subtopics: Replication and Read Replicas.

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Streaming replication keeps a standby almost in sync. Async is faster for the primary; sync waits for the standby (safer, slower).

A single disk is not a durability story. Replicas are also your HA and analytics source.

Pick async vs sync from your RPO. Monitor replication slots and disk. Test failover; untested replicas are fiction.

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